Smoking tobacco hurts the alveoli, does weed also do this?

Yes: Smoke of any kind irritates the lining of the lungs.

It's worse: Cigarette manufacturers have been developing low tar and nicotine brands for more than 1/2 a century. By contrast, mj users want the most potent mj. Mj has tars just like tobacco. One mj cigarette is thought to be as bad for your lungs as a pack of low tar and nicotine filtered tobacco cigarettes. You're still inhaling the smoke from burning leaves, after all.